Green Frame A.T.R.O.X. is a second stage upgrade of the Green Frame. It is a advanced guerilla warfare type mobile suit. Much of its new design is inspired by the Blue Frame Third and Blue Frame scale system. It is adept at both land and underwater combat. Specs and name are:

A primarily space use Gundam, it was originally built by the Innovators as a copy of the Fereshte Sadalsuud Type F, this unit was thought abandoned, only to be found by a civilian. It is equipped with a retractable wrist heat blade, beam cannons in the upper sensor docks, and a high output sniper rifle, similar to that of the Dynames GN Sniper rifle, designated, GN 2 Rifle

True, in some shows you can't take a walk in the woods/caves without stumbling over abandoned weapons of mass destruction, left there to wait for a worthy pilot (or, just anyone who might wander around, really).

_________________-We will not be caught by surprise!
*Almost everyone I've killed uttered similar last words.
-Then I am glad once again that you are on my side.
*They've often said that too.